L2 - System Development Methodologies

L2 - System Development Methodologies - System Development...

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System Development Methodologies Ch. 3
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Build Me a Pretty House! 2
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Process of System Development System development process – a set of activities, methods, best practices, deliverables, and automated tools that stakeholders (Chapter 1) use to develop and continuously improve information systems and software (Chapters 1 and 2). Many variations Using a consistent process for system development: § Create efficiencies that allow management to shift resources between projects § Produces consistent documentation that reduces lifetime costs to maintain the systems § Promotes quality 3
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System Lifecycle 4
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Representative System Development Methodologies Architected Rapid Application Development (Architected RAD) Dynamic Systems Development Methodology (DSDM) Joint Application Development (JAD) Information Engineering (IE) Rapid Application Development (RAD) Rational Unified Process (RUP) Structured Analysis and Design eXtreme Programming (XP) 5
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System Development Problems One survey (Gladden 1982) estimates that 75% of IS developments undertaken are never completed, or the resulting system is never used. According to the Standish Group (1995) only 16% of all projects are delivered on time and within their budget. This study, conducted as a survey among 365 information technology managers, also reveals that 31% of ISD projects were canceled prior to completion and the majority, 53%, are completed but over budget and offer less functionality than originally specified. Problems include low productivity, a large number of failures, and an inadequate alignment of ISs with business needs . 6
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Capability Maturity Model (CMM) 7
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Costs to Fix a Software Defect Development Phase Relative Cost of Repair Requirements 0.1 -- 0.2 Design 0.5 Coding 1 Unit test 2 Acceptance test 5 Maintenance 20 8
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Principles of System Development Get the system users involved. Use a problem-solving approach. Establish phases and activities. Document through development. Establish standards. Manage the process and projects Justify systems as capital investments. Don’t be afraid to cancel or revise scope. Divide and conquer. Design systems for growth and change. Real World? 9
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Local vs. Global Local A business unit seeks to solve a problem or take advantage of an opportunity Global – Strategic Planning a formal strategic plan (3-5 years) for an entire business that defines its mission, vision, goals, strategies, benchmarks, and measures of progress and achievement. Usually, the strategic enterprise plan is complemented by strategic business unit plans that define how each business unit will contribute to the enterprise plan. The information systems plan is one of those unit-level plans.
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